There are multiple versions of GTWP on my site. I have GoToWP premium, but I keep getting a warning:
“The GoToWP Premium for GoToTraining API Key has not been activated, so the plugin is inactive! Click here to activate GoToWP Premium for GoToTraining.”

Yes, I have followed the instructions for activating GTWP without too much trouble. But then this still comes up regardless.

Where can I find the original zip file so I can uninstall, and reinstall to clear things up?